The role of metal nanoparticles and nanonetworks in alloy. Study of the metal dusting behaviour of hightemperature. The corrosion manifests itself as a breakup of bulk metal to metal powder hence the term, metal dusting. Metallurgical investigation of metal dusting corrosion in. Most important, spiral metal pipe is conductive, and simple and easy to ground, even when. Corrosion resistance of ni50cr hvof coatings on 310s. Steel and manufacturing handbook free download pdf ebook. Holmer road, uk abstract longterm testing has been conducted in a laboratory environment which promotes metal dusting. Carbide phase formation and decomposition cycles within the material hemispherical pits uniform attack.
Rink, energy technology division, argonne national laboratory introduction metal dusting is a metal loss process that occurs in hot reactive gases. Development of materials resistant to metal dusting degradation anl0614. The prerequisite for metal dusting is that carbon activity in the gas phase has to be 1. Ra 602 ca one of the most oxidation resistant high strength, heat resistant nickel alloys available. Also, the build up of coke during the process requires regular decoking. Inhibition of metal dusting using thermal spray coatings. Nanoindentation testing of alloy 693, 600, h46m and 602ca, after exposure to the metal dusting environment, showed that there was a significant increase in hardness in the reaction zones compared with the bulk hardness values. Metal dusting, pig tails, refinery, nickel alloys, alloy 602ca, uns n06025, high temperature corrosion, carburization, chromiaalumina scale. Nickel based alloys to prevent metal dusting degradation. He found that the arcspray coating exhibited excellent protection against metal dusting damage in those areas. Overall, there is disagreement regarding appropriate alloy selection. Pdf the corrosion phenomenon named metal dusting has been observed in.
In the case of local scale damage,the corrosive environment gets access to the depleted material, which. In addition, layers of chrome oxide, spinel and aluminum oxide can be used. Materials performance in metal dusting environment z. Fe, ni and co, as well as alloys based on these metals are all susceptible. Alloy 602ca is characterized by excellent high temperature creep properties. Alloy 602ca is characterized by excellent high temperature creep properties, excellent fatigue resistance in the hcf and lcf mode and. Metal dusting is an erosion process in which a metallic component disintegrates into a dust of fine metal and metal oxide particles mixed with carbon. Alloy 602ca is a grade steel with higher nickel chromium. To learn about our use of cookies and how you can manage your cookie settings, please see our cookie policy. The article includes a multilayer tubing having an alloy layer and a copper layer. South african institute of mining and metallurgy, 1 2 february 20 8190. Disclosed is a method and system for reducing the formation of metal catalyzed sidereaction byproducts formed in the feed vaporization and introduction system of a methanol to olefin reactor system by forming andor coating one or more of the heating devices, feed lines or feed introduction nozzles ofwith a material that is resistant to the formation of metal catalyzed side. Under these conditions, the alloys undergoing metal dusting develop pits and holes on the surface, and then disintegrate into a powdery mixture of carbon, oxides, carbides, and fine metal particles. Holland 15 successfully used arcspray and hvof coatings of ni50cr on 1cr0.
Metallurgical investigations of metal dusting corrosion in plant exposed nickelbased alloy 602ca, presented at the eurocorr 2004 conference in nice, france, 12. Iron and nickel, model alloys of nicu and fecr, and commercial heat resisting alloys were exposed at 650680oc to flowing coh2h2o gases which were supersaturated with respect to carbon. Metallurgical investigation of metal dusting corrosion in plantexposed nickelbased alloy 602ca september 2005 corrosion engineering science and technology 403. Ns industries is now stocking 602ca lower cost calls. The effect of the matrix structure on the metal dusting. This chapter focuses on the metal dusting md behavior of welded nibase alloys with different surface finishes. Metal dusting is a severe form of corrosive degradation of metals and alloys at high temperatures 300850oc in carbonsupersaturated gaseous environments.
This metal loss decreases component lifetimes, ultimately leading to failure 1. Case histories on successful applications of alloy 602ca, uns n06025 in high temperature environments jason wilson. An article of manufacture for reducing susceptibility of a metal pipe to metal dusting degradation. Irns as 9120 certified ims international iso 9001 certified q4a jest 4 alloys. High temperature corrosion testing in oxidisingcarburising and metal dusting environments pdf 12. South african institute of mining and metallurgy, 7a july 2012 589600. Applications vdm alloy 602 ca has a wide range of application in the hightemperature field of thermotechnical and chemical processes, in power plants and in the automotive industry. Metal dusting causes disintegration of the metal into a dust of graphite and metal particles. It has no deliberate addition of iron, an element which is detrimental to the performance of. Coupon testing of alloys in simulated metal dusting atmosphere consisting of. Conventional metal dusting protection by high alloyed materials always leads to an oxide former.
Alloy 800 is an austenitic ironbased alloy, whereas alloy 602ca is a nickelbased alloy. Ns industries is now stocking inconel tube inserts. Metal dusting corrosion occurs in many metallic alloys, particularly fe, co and nibase alloys, when exposed to carbonaceous atmospheres. Special metals has over a century of expertise creating highperformance alloy products engineered for the most brutal, missioncritical services in the industry.
Ra 602 ca provides some of the best combined high temperature properties of. Us20100266865a1 nickel based alloys to prevent metal. Metal dusting corrosion has negatively impacted the efficiency and. Metal dusting is a metal loss process that occurs in hot reactive gases the prerequisite for metal dusting is that carbon activity in the gas phase has to be 1 metal ends up as fine powder pitting and crevice attack are common forms environments conducive to metal dusting are reformers of different types e. However, the alloy with the best performance was austenitic inconel 625, which was still protected by its cr2o3 scale after 500 onehour cycles. Inhibition of metal dusting using thermal spray coatings and laser treatment k. This paper describes the development of one such nickel base alloy alloy 602ca uns n06025 which has provided an unique combination of properties by optimization of various alloying elements. Shoemaker special metals corporation 3200 riverside drive huntington, wv s. The alloy layer can include a ni based, an al based and an fe based alloy layer. The combination of high aluminum and chromium additions to ra 602 ca results in a resistance to metal dusting superior to alloys such as ra330, 600, 601, and 800hat. When the temperature is lower and the carbon activity is greater than one, another mode of corrosion, metal dusting, is observed. By closing this message, you are consenting to our use of cookies.
Pdf the corrosion phenomenon named metal dusting has been observed in many hightemperature industrial plants. Industrial member report summary key findings for industry. Study metal dusting phenomenon in simulated process. In the right environment, it appears that any alloy can eventually produce metal dust. Development of materials resistant to metal dusting degradation. Metal dusting corrosion initiation in conversion of. Generally, metal dusting occurs in a localized area, and how rapidly the. Material is gradually turned into a dustlike corrosion product also contains carbides and oxides. In this report, the recent research of metal dusting mechanism is summarized.
This paper describes the development of one such nickel base alloy alloy 602ca uns n06025, which has provided a unique combination of properties by. The onset of metal dusting was more accelerated for most austenitic engineering alloys alloy 800, inconel 601, 690, 693 and alloy 602ca than for engineering ferritic steels fe27cr0. Metal dusting metal dusting is a form of carburization that can lead to the rapid corrosion of heat resistant alloys. Development of materials resistant to metal dusting. All ferritic materials, including chromia and alumina formers, developed a coke deposit of carbon nanotubes, the growth of which was catalysed by nanoparticles of fe3c. Alloy 602ca when producing ferrules in order to meet any customer need. Find nickel alumina catalyst related suppliers, manufacturers, products and specifications on globalspec a trusted source of nickel alumina catalyst information. Of particular interest to the designer is the alloys resistance to metal dusting. Alloy 602ca, uns n06025, applications, high temperature, corrosion resistance, oxidation, carburization, metal dusting, high temperature strength. Us7338645b2 method and system for reducing decomposition. Resistant to metal dusting degradation anl0614 by k. Analysis tools in metal dusting research, presented at corrosion2005, technology exchange group meeting, teg128x, houston, texas, usa, 3.
Pdf metal dusting is a catastrophic form of carburization attack that takes place in. Vdm alloy 602 ca is a hightemperature material with excellent resistance to. Metal dusting, also know as catastrophic carburization or carbon rot, is a metal wastage, not an embrittlement phenomenon. Corrosion in oxidisingcarburisingmetal dust environments. Szakalos a new corrosion mechanism for metal dusting on 304l stainless. Radiant tubes furnace muffles rotary and shaft furnaces. Metal dusting is a corrosion phenomenon that occurs in strongly carburizing gas atmospheres at elevated temperatures. Metal dusting prevention by two protection systems in one. Metal dusting behaviour of welded nibase alloys with.
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